1、Designation: A370 17aA370 18Standard Test Methods and Definitions forMechanical Testing of Steel Products1This standard is issued under the fixed designation A370; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 These test methods2 cover procedures a
3、nd definitions for the mechanical testing of steels, stainless steels, and related alloys.The various mechanical tests herein described are used to determine properties required in the product specifications. Variationsin testing methods are to be avoided, and standard methods of testing are to be f
4、ollowed to obtain reproducible and comparableresults. In those cases in which the testing requirements for certain products are unique or at variance with these generalprocedures, the product specification testing requirements shall control.1.2 The following mechanical tests are described:SectionsTe
5、nsion 6 to 14Bend 15Hardness 16Brinell 17Rockwell 18Portable 19Impact 20 to 30Keywords 321.3 Annexes covering details peculiar to certain products are appended to these test methods as follows:AnnexBar Products Annex A1Tubular Products Annex A2Fasteners Annex A3Round Wire Products Annex A4Significan
6、ce of Notched-Bar Impact Testing Annex A5Converting Percentage Elongation of Round Specimens toEquivalents for Flat SpecimensAnnex A6Testing Multi-Wire Strand Annex A7Rounding of Test Data Annex A8Methods for Testing Steel Reinforcing Bars Annex A9Procedure for Use and Control of Heat-Cycle Simulati
7、on Annex A101.4 The values stated in inch-pound units are to be regarded as the standard.1.5 When this document is referenced in a metric product specification, the yield and tensile values may be determined ininch-pound (ksi) units then converted into SI (MPa) units. The elongation determined in in
8、ch-pound gauge lengths of 2 or 8 in.may be reported in SI unit gauge lengths of 50 or 200 mm, respectively, as applicable. Conversely, when this document isreferenced in an inch-pound product specification, the yield and tensile values may be determined in SI units then converted intoinch-pound unit
9、s. The elongation determined in SI unit gauge lengths of 50 or 200 mm may be reported in inch-pound gaugelengths of 2 or 8 in., respectively, as applicable.1.5.1 The specimen used to determine the original units must conform to the applicable tolerances of the original unit systemgiven in the dimens
10、ion table not that of the converted tolerance dimensions.NOTE 1This is due to the specimen SI dimensions and tolerances being hard conversions when this is not a dual standard. The user is directed toTest Methods A1058 if the tests are required in SI units.1 These test methods and definitions are un
11、der the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and are the direct responsibility ofSubcommittee A01.13 on Mechanical and Chemical Testing and Processing Methods of Steel Products and Processes.Current edition approved Nov. 15, 2017Dec. 1, 2018. Published Dece
12、mber 2017January 2019. Originally approved in 1953. Last previous edition approved in 2017 asA370 17.A370 17a. DOI: 10.1520/A0370-17A.10.1520/A0370-18.2 For ASME Boiler and Pressure Vessel Code applications see related Specification SA-370 in Section II of that Code.This document is not an ASTM stan
13、dard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all case
14、s only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.6 Attention is
15、 directed to ISO/IEC 17025 when there may be a need for information on criteria for evaluation of testinglaboratories.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropria
16、te safety, health, and environmental practices and determine the applicability ofregulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development
17、of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3A623 Specification for Tin Mill Products, General RequirementsA623M Specification for Tin Mill Products, General Require
18、ments MetricA833 Test Method for Indentation Hardness of Metallic Materials by Comparison Hardness TestersA956A956/A956M Test Method for Leeb Hardness Testing of Steel ProductsA1038 Test Method for Portable Hardness Testing by the Ultrasonic Contact Impedance MethodA1058 Test Methods for Mechanical
19、Testing of Steel ProductsMetricA1061/A1061M Test Methods for Testing Multi-Wire Steel Prestressing StrandE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE8/E8M Test Methods for Tension Testing of Metallic MaterialsE10 Test Method for Bri
20、nell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic MaterialsE23 Test Methods for Notched Bar Impact Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE83 Practice for Verification and Cla
21、ssification of Extensometer SystemsE110 Test Method for Rockwell and Brinell Hardness of Metallic Materials by Portable Hardness TestersE190 Test Method for Guided Bend Test for Ductility of WeldsE290 Test Methods for Bend Testing of Material for Ductility2.2 ASME Document:4ASME Boiler and Pressure
22、Vessel Code, Section VIII, Division I, Part UG-82.3 ISO Standard:5ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories3. Significance and Use3.1 The primary use of these test methods is testing to determine the specified mechanical properties of steel, stainl
23、ess steel,and related alloy products for the evaluation of conformance of such products to a material specification under the jurisdiction ofASTM Committee A01 and its subcommittees as designated by a purchaser in a purchase order or contract.3.1.1 These test methods may be and are used by other AST
24、M Committees and other standards writing bodies for the purposeof conformance testing.3.1.2 The material condition at the time of testing, sampling frequency, specimen location and orientation, reportingrequirements, and other test parameters are contained in the pertinent material specification or
25、in a General RequirementSpecification for the particular product form.3.1.3 Some material specifications require the use of additional test methods not described herein; in such cases, the requiredtest method is described in that material specification or by reference to another appropriate test met
26、hod standard.3.2 These test methods are also suitable to be used for testing of steel, stainless steel and related alloy materials for otherpurposes, such as incoming material acceptance testing by the purchaser or evaluation of components after service exposure.3.2.1 As with any mechanical testing,
27、 deviations from either specification limits or expected as-manufactured properties canoccur for valid reasons besides deficiency of the original as-fabricated product. These reasons include, but are not limited to:subsequent service degradation from environmental exposure (for example, temperature,
28、 corrosion); static or cyclic service stresseffects, mechanically-induced damage, material inhomogeneity, anisotropic structure, natural aging of select alloys, furtherprocessing not included in the specification, sampling limitations, and measuring equipment calibration uncertainty. There is3 For r
29、eferencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from American Society of Mechanical Engineers (ASME), AS
30、ME International Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.5 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.A370 182statistical variation in all aspects of mechanical testing and variations
31、 in test results from prior tests are expected.An understandingof possible reasons for deviation from specified or expected test values should be applied in interpretation of test results.4. General Precautions4.1 Certain methods of fabrication, such as bending, forming, and welding, or operations i
32、nvolving heating, may affect theproperties of the material under test. Therefore, the product specifications cover the stage of manufacture at which mechanicaltesting is to be performed. The properties shown by testing prior to fabrication may not necessarily be representative of the productafter it
33、 has been completely fabricated.4.2 Improperly machined specimens should be discarded and other specimens substituted.4.3 Flaws in the specimen may also affect results. If any test specimen develops flaws, the retest provision of the applicableproduct specification shall govern.4.4 If any test speci
34、men fails because of mechanical reasons such as failure of testing equipment or improper specimenpreparation, it may be discarded and another specimen taken.5. Orientation of Test Specimens5.1 The terms “longitudinal test” and “transverse test” are used only in material specifications for wrought pr
35、oducts and are notapplicable to castings. When such reference is made to a test coupon or test specimen, the following definitions apply:5.1.1 Longitudinal Test, unless specifically defined otherwise, signifies that the lengthwise axis of the specimen is parallel to thedirection of the greatest exte
36、nsion of the steel during rolling or forging. The stress applied to a longitudinal tension test specimenis in the direction of the greatest extension, and the axis of the fold of a longitudinal bend test specimen is at right angles to thedirection of greatest extension (Fig. 1, Fig. 2a, and Fig. 2b)
37、.5.1.2 Transverse Test, unless specifically defined otherwise, signifies that the lengthwise axis of the specimen is at right anglesto the direction of the greatest extension of the steel during rolling or forging. The stress applied to a transverse tension testspecimen is at right angles to the gre
38、atest extension, and the axis of the fold of a transverse bend test specimen is parallel to thegreatest extension (Fig. 1).5.2 The terms “radial test” and “tangential test” are used in material specifications for some wrought circular products and arenot applicable to castings. When such reference i
39、s made to a test coupon or test specimen, the following definitions apply:5.2.1 Radial Test, unless specifically defined otherwise, signifies that the lengthwise axis of the specimen is perpendicular to theaxis of the product and coincident with one of the radii of a circle drawn with a point on the
40、 axis of the product as a center (Fig.2a).5.2.2 Tangential Test, unless specifically defined otherwise, signifies that the lengthwise axis of the specimen is perpendicularto a plane containing the axis of the product and tangent to a circle drawn with a point on the axis of the product as a center (
41、Fig.2a, Fig. 2b, Fig. 2c, and Fig. 2d).FIG. 1 Relation of Test Coupons and Test Specimens to Rolling Direction or Extension (Applicable to General Wrought Products)A370 183TENSION TEST6. Description6.1 The tension test related to the mechanical testing of steel products subjects a machined or full-s
42、ection specimen of thematerial under examination to a measured load sufficient to cause rupture. The resulting properties sought are defined inTerminology E6.6.2 In general, the testing equipment and methods are given in Test Methods E8/E8M. However, there are certain exceptionsto Test Methods E8/E8
43、M practices in the testing of steel, and these are covered in these test methods.7. Terminology7.1 For definitions of terms pertaining to tension testing, including tensile strength, yield point, yield strength, elongation, andreduction of area, reference should be made to Terminology E6.FIG. 2 Loca
44、tion of Longitudinal Tension Test Specimens in Rings Cut from Tubular ProductsA370 1848. Testing Apparatus and Operations8.1 Loading SystemsThere are two general types of loading systems, mechanical (screw power) and hydraulic. These differchiefly in the variability of the rate of load application.
45、The older screw power machines are limited to a small number of fixedfree running crosshead speeds. Some modern screw power machines, and all hydraulic machines permit stepless variationthroughout the range of speeds.8.2 The tension testing machine shall be maintained in good operating condition, us
46、ed only in the proper loading range, andcalibrated periodically in accordance with the latest revision of Practices E4.NOTE 2Many machines are equipped with stress-strain recorders for autographic plotting of stress-strain curves. It should be noted that somerecorders have a load measuring component
47、 entirely separate from the load indicator of the testing machine. Such recorders are calibrated separately.8.3 LoadingIt is the function of the gripping or holding device of the testing machine to transmit the load from the heads ofthe machine to the specimen under test. The essential requirement i
48、s that the load shall be transmitted axially. This implies thatthe centers of the action of the grips shall be in alignment, insofar as practicable, with the axis of the specimen at the beginningand during the test and that bending or twisting be held to a minimum. For specimens with a reduced secti
49、on, gripping of thespecimen shall be restricted to the grip section. In the case of certain sections tested in full size, nonaxial loading is unavoidableand in such cases shall be permissible.8.4 Speed of TestingThe speed of testing shall not be greater than that at which load and strain readings can be madeaccurately. In production testing, speed of testing is commonly expressed: (1) in terms of free running crosshead speed (rate ofmovement of the crosshead of the testing machine when not under load), (2) in terms of rate of separation of the two heads of thetesti
